Professional teams practice over and over again to make the transition from raw talent to finely honed, instinctive skill. They practice to identify the strengths and weaknesses of both individual players and the team as a whole. They practice so that the plays in the playbook become second nature. Finally, they practice to make the transition from a collection of individual athletes to a real team. Beyond that, individual players do extensive strength and speed training on their own to meet explicit or implicit performance expectations from the coaches.